Verflüssigung von hoch‐inkohlten Steinkohlen nach Hydrierung in Gegenwart von Boran‐ oder Iod‐Homogenkatalysatoren

Abstract

Angesichts der Explosion des Ölpreises ist die Entwicklung neuer Prozesse zur Kohleverflüssigung eine Option für künftige Treibstoffe. Die erste „echte“ Kohlehydrierung im Sinne einer umfassenden Wasserstoffaddition an ungesättigte Strukturen ermöglicht eine Verflüssigung auch von hoch‐inkohlten Steinkohlen, die sich bisher nur in Verbrennungs‐ und Vergasungsprozessen nutzen lassen.

Early Main‐Group Metal Catalysts for the Hydrogenation of Alkenes with H2

“…Hitherto, very few reports on the use of main‐group metal catalysts in alkene hydrogenation have appeared. Recently, iodoboranes were introduced as Lewis acidic catalysts for the liquefaction of coal by hydrogenation (280–350 °C, 150–250 bar H 2 ) 12a. Earlier reports on hydridic hydrogenation catalysts include processes mediated by soluble LiAlH 4 12b or by suspensions of NaH, KH, and MgH 2 12c.…”

Frustrated Lewis Pair Chemistry: Development and Perspectives

“…In this manner, FLPs effect a reaction that is normally attributed to the chemistry of transition-metal surfaces or homogeneous transition-metal complexes. [12] Theoretical chemists rapidly started analyzing this situation. [13] Although differing in detail, most computational studies now seem to converge on a description that involves concerted pathways of H À H cleavage and formation of the [PH] + and [HB] À moieties.…”

Frustrated Lewis Pairs: Metal‐free Hydrogen Activation and More

“…[73] Haenel et al described a related procedure for the liquefaction of coal using homogeneous borane catalysts. [74] Dihydropyridines are increasingly used as alternative hydrogen sources for the organocatalytic hydrogenation of carbonyl and imine substrates by means of proton and hydride transfer. Asymmetric hydrogenation using chiral Brønsted acids has become an increasingly important variant.…”